Merge pull request redhat-openstack#235 from guessi/fix_virtual_detection

fix `is_virtual` detection issue

Author: hunner

templates/ntp.conf.erb

@@ -38,7 +38,7 @@ broadcastclient
 server <%= server %><% if @iburst_enable == true -%> iburst<% end %><% if @preferred_servers.include?(server) -%> prefer<% end %>
 <% end -%>
 
-<% if scope.lookupvar('::is_virtual') == "false" or @udlc -%>
+<% if @is_virtual == "true" or @udlc -%>
 # Undisciplined Local Clock. This is a fake driver intended for backup
 # and when no outside source of synchronized time is available. 
 server	127.127.1.0